“One“ - ’A Chorus Line’

Richard Attenborough’s 1985 movie of this long-running Broadway musical came in for a lot of criticism, since it frequently departed from the show’s plot, unnecessarily added and deleted songs, and suffered from some mis-casting of the principals. However, the finale was a choreographic tour-de-force of precision dancing, as the number of people on-stage multiplied by the second, all helped by mirrors at the back!